Numerade

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An endothermic reaction takes place in an isothermal, closed container of fixed volume. The internal energy of the container ____________.

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O Exponents and Polynomals Multiplying binomials in two variables Multiply. (5c+2d)(c+7d) Simplify your answer.

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f Angie's belief about the effect of advertising is correct, she _______. A. can increase her economic profit by advertising B. can increase her economic profit by advertising only if she lowers the price of a picture frame C. can increase her economic profit by advertising only if she raises the price of a picture frame D. cannot increase her economic profit by advertising because advertising increases her average total cost E. cannot increase her economic profit by advertising because advertising increases her total cost

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v (m/s) 16 12 8 4 0 -4 -8 -12 -16 6 12 18 24 (s) ? (a) What is the average acceleration of the object during the following time intervals? (Enter your answers in m/s$^2$. Indicate the direction with the signs of your answers.) (i) 0 s to 6.00 s m/s$^2$ (ii) 6.00 s to 18.0 s m/s$^2$ (iii) 0 s to 24.0 s m/s$^2$ (b) What is its instantaneous acceleration at each of the following times? (Enter your answers in m/s$^2$. Indicate the direction with the signs of your answers.) (i) 4.00 s m/s$^2$ (ii) 12.0 s m/s$^2$ (iii) 23.0 s

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4. One kicks a football upward. On the way up, it passes the roof of a building at height $h$ in time $t$ after the kick. What is the total time the football is in the air, from when it was kicked to when it lands back on the ground? (1) $\frac{2h}{gt} + t$ (2) $\frac{2h}{gt} - t$ (3) $\frac{h}{gt} + t$ (4) $\frac{h}{gt} - t$ (5) $\frac{h}{gt} + 2t$ Make y-axis go up and y=0 at the ground level. 1D motion with constant acceleration: $y_f = y_i + v_it + \frac{1}{2}at^2$ In this problem: At the time the ball passes the roof: $h = 0 + v_it - \frac{1}{2}gt^2$ At the time when the ball lands back on ground: $0 = 0 + v_iT - \frac{1}{2}gT^2$ Two equations, two unknowns ($v_i$ and $T$): one can solve for both.

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C++ 1. Write a new program (hw6-pr1) meeting at least the following minimum requirements: Opens the text version of this file (hw6-Spring2017.txt) and searches thru the file for the first occurrence of each of the 26 uppercase characters of the alphabet (A-Z), then each the 10 digits (0-9), and finally each of the 26 lowercase characters of the alphabet (a-z). As it finds each of these characters it should also record its position in the file (assume the first character in the file is in position 1). If the character or digit is not found in the file then it should be recorded as "Not Found" [HINT!! Use location=0 to indicate "Not Found"]. Display (5 per line) each of the alphanumeric characters (in the same order the search was done) immediately followed by its location in the file. Use exactly 10 columns to display each character/location pair as follows: character, 1 space, 6 digit location with no leading zeros, 2 spaces. For "Not Found" characters display location as NotFnd. NOTE!!!! You MUST specify in your testing doc how you are handling Whitespace in the file (i.e. skipping or counting). EXTRA CREDIT (20 points): Display (5 per line) each of the alphanumeric characters (in the order they were found in the file) immediately followed by its location in the file. Use exactly 10 columns to display each character/location pair as follows: character, 1 space, 6 digit location with no leading zeros, 2 spaces. "Not Found" characters should be displayed at the beginning of the list with location shown as NotFnd.

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The following information is related to December 31, 2018 balances. • Accounts receivable • Allowance for doubtful accounts $315,000 27,000 During 2019, sales on account were $87,000 and collections on account were $51,600. Also, during 2019, the company wrote off $4,800 in uncollectible accounts. An analysis of outstanding receivable accounts at year end indicated that uncollectible accounts are estimated at $32,400. Calculate Bad Debt Expense for 2019.

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(1) Consider a turbulent wake far behind a 2D airfoil as shown in Fig. 1. According to a simple model of turbulence, the velocity profile at the far downstream of the wake is given by $u_x(x, y) = V_\infty - Cx^{-1/2} exp(-\alpha y^2 / x)$, where $x$ is the streamwise coordinate, $y$ is the coordinate across the wake, $V_\infty$ is the freestream velocity, and $C$ and $\alpha$ are constants. (a) Please calculate the drag using the following formula based on wake survey (Hint: x is treated as a constant in the integral) (10 points) $D = \rho \int_{-\infty}^{\infty} u_x(x, y)[V_\infty - u_x(x, y)] dy$ (b) Should the drag D depend on x? (5 points) (c) If the drag D depends on x, is there anything wrong? Give your explanation based on your physical intuition. (5 points) Note that you have a special integral called the Gaussian integral. The value of the Gaussian integral can be found in mathematics handbooks or internet.

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TRUE / FALSE In MATLAB, the single equal sign '=' is the replacement operator. 4. What is the result after running the following MATLAB code in the Commnd Window? Be specific, what is displayed after each command is executed and what value is each variable? >> num = 7; >> num = num - 5; >> num = num * -2; >> num = num * 2; >> 5 * 2 + 3 * 5 >> num = num + ans

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Determine the $Z_t$, $I_{tot}$, $V_{L1}$ and $V_{AB}$ in the RL circuit shown in Figure 2 if the voltage source is 40 < 0° V and f= 250 hz. [25 Marks] [CO2, PO2, C4] 48 mH $X_{L2}$ A $V_s$ 29 mH $X_{L3}$ $I_{tot}$ $R_1$ $R_2$ B W 50 Ohm 68 Ohm $X_{L1}$ 64 mH

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loretta c.